Too much heat in two rooms (short/long term solutions?)

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Old 11-07-12, 08:42 AM
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Too much heat in two rooms (short/long term solutions?)

Hopefully I can keep this short, but clear.

The two north rooms on our second floor (zone 2) get way too warm when compared to the rest of the floor. The t-stat is in the hallway.
The rooms share a long baseboard style rad (~15ft long) which is in the middle of the zone loop.
Combined, the two rooms are ~35ft (East to West) by 12ft (2 outside walls in each room, three total).

The rad does have a t-stat/valve of some sort which I'm guessing was used prior to the introduction of the central t-stats. This means that each rad was independently controlled way back when. It has a dial with temp markings (like an electric) and a tempurature prob.I don't know if they had been used since the 70's however (guessing that is when the central t-stat was introduced).
Not sure if I should look at trying to use it, or not knowing it hasn't been used in a long time. (sorry, no pics of the on rad control)
Thoughts?

I was also thinking of adding a grate type vent in the wall of these rooms to allow the heat to excape with the doors are closed. Not the prefered method in my mind, but...

Any other short term or long term solutions for this issue?


The main loop for this zone is accessable in the 2ft crawl space between the main floor and second floor. It's about 30ft crawl from the closest access point.
 
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Old 11-07-12, 09:44 AM
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Im having a hard time understanding your setup. You have 2 zones and zone 2 overheats and zone 1 is ok?
 
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Old 11-07-12, 10:30 AM
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RDSTEAM,
I have 2 zones and for the most part, both work great (7 day programmable t-stats, circulation pump per zone, cold start aquastat).

The problem is, on my second floor, two rooms share one baseboard (goes through the deviding wall) and those 2 rooms are getting too warm. When the floor is occupied (say 6AM), the zone t-stat is set to 68'F. Those rooms will be in the mid 70's (probably ~75'F).
Those two rooms are the bedrooms for my 1yrs old and 3yrs old, so leaving the door open might not be the best idea.
The t-stat is located in the hallway.

The pic below is a not to scale sketch of my second floor. The rooms in question are the two at the top. The rad is along the most north wall (top) below 4 windows (2 in each room).
The t-stat is located on the hallway wall, beside the maid stairs near the bathroom (middle right)
Name:  SecondFloorCrop.jpg
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Hope that makes sense.
The boiler is a cold start, max temp is ~170'F.
 
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Old 11-07-12, 10:41 AM
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You may have too many btuhs going into those rooms as opposed to other rooms. If your move the stat from the hallway to the bedrooms that may cause the other rooms to be much cooler. If the valve still works on that rad with the issue try closing it down a little at a time until you reach the desired temps. This will be the short term answer and will take a couple days of adjusting but for now it should work. For a long term answer theres a few ways you can go. Get rid of the rad in the kids rooms and lessen the btuh output with something smaller, add heat in the hallway, add a thermostatic valve to the problem rad. Use the slant fin heat calculator to see how many btuh each room needs and match it up to whats in there now.
 
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Old 11-09-12, 07:36 PM
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add a thermostatic valve to the problem rad.
This sounds as though there already are TRV(s) on the rad(s):

The rad does have a t-stat/valve of some sort which I'm guessing was used prior to the introduction of the central t-stats. This means that each rad was independently controlled way back when. It has a dial with temp markings (like an electric) and a tempurature probe.

photo courtesy taco-hvac.com

This pic shows one type... there are many out there. Is this what you think you might have?
 
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Old 11-10-12, 06:01 AM
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Correct Trooper, I have one like that on each rad (much older looking however).
To confirm it was working or not, I turned it down to between the 40-50 markings and didn't see any results. I'm assuming is dead as expected. Does sounds like a easy long term solution for this issue should I replace it.
 
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Old 11-10-12, 08:31 AM
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should I replace it.
I would think so...

It sounds like the PO of your home had the same problem and 'solved' it by the addition of the TRVs which since have gone defective.

Is there any manufacturer / model info on them? Wonder if you can still get replacement parts. Might be an easy fix if you can.
 
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Old 11-10-12, 05:48 PM
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I believe you are right Trooper. The previous owners did mention that they had gotten the second zone setup with the two smaller pumps. I would have to guess, the t-stat was on the main floor, and they used the controls on the rads on the second floor to control the heat. There are no controls on the rads on the main floor, so I think this confirms that.
I suspect these where installed many years ago, and not by the folks I bought the place from.
 
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Old 11-10-12, 05:52 PM
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I have heard of people covering the fins in the baseboard with aluminum foil to reduce heat output. That could be another option if installing a new TRV would be problematic.
 
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